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Problem 46 Easy Difficulty

An observer in a coasting spacecraft moves toward a mirror at speed $v$ relative to the reference frame labeled by $\mathrm{S}$ in Figure P 26.46. The mirror is stationary with respect to $\mathrm{S}$ . A light pulse emitted by the spacecraft travels toward the mirror and is reflected back to the spacecraft. The spacecraft is a distance $d$ from the mirror (as measured by observers in $\mathrm{S} )$ at the moment the light pulse leaves the spacecraft. What is the total travel time of the pulse as measured by observers in (a) the S frame and (b) the spacecraft?

Answer

1.47 $\mathrm{km}$

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Video Transcript

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